CN1838131A - Design method for roller diameter of four-roller high-strength steel planishing mill - Google Patents

Abstract

This invention relates to a design method for roller diameter of four-roller high-strength steel planishing mill, which comprises the following steps: (a) gathering the production outline for being-designed temper mill; (b) gathering correlated feature parameters; (c) according to the outline, grouping all products by given rule; (d) searching the optimal parameters for single temper process; (e) taking integrated optimum design. Wherein, it makes a compromise to plate shape and roller consumption by making both the tension of strap steel before output and horizontal pressure distribution among rollers as optimized objective functions and letting all steel product mechanical properties meet outline request as constraint condition. Thereby, This invention can ensure product shape quality, reduces roller consumption, and meets total mechanical request.

Description

The method for designing of roller diameter of four-roller high-strength steel planishing mill

Technical field

The present invention relates to a kind of smooth designing technique, particularly a kind of method for designing of roller diameter of four-roller high-strength steel planishing mill.

Background technology

In recent years, along with the fast development of auto industry, the user is also more and more higher to the requirement of Automobile Plate, transfers the requirement material to by the good deep-draw characteristic of original pursuit and takes into account deep-draw characteristic and strength characteristics, therefore, has promoted iron and steel enterprise to develop high-strength steel energetically.The exploitation of high-strength steel and production have become the measurement sign of iron and steel enterprise's production level height.And planisher is as the procedure of high-strength steel production near finished product, and it directly has influence on the technical indicator such as mechanical property, plate shape, surface quality of finished product high-strength steel.Therefore, the key of determining just to become the smooth production of assurance high-strength steel that the high-strength steel planishing mill designing technique is comprised working roll and backing roll diameter.

At present, in the world to the research of high-strength steel planishing mill designing technique aspect starting early be Nippon Steel, the high strength planisher that the said firm designs and develops can be produced the high-strength steel that the maximum intensity rank is 1180Mpa.And enterprises such as the A Saile (Arcelor) in the POSCO of Korea S, Europe and Kawasaki Steel company, Kobe Steel are also fruitful aspect the design studies of high-strength steel planishing mill.But needs for intellectual property protection and technical monopoly; these technology are not disclosed and promote the use of; still be in the secret stage; to also not retrieving at present any foreign literature, therefore the research of high-strength steel planishing mill roller footpath designing technique is remained the emphasis of various countries iron company technological development about high-strength steel planishing mill roller footpath design aspect.

At home, belong to blank, also do not retrieve any pertinent literature for research for high-strength steel planishing mill roller footpath design aspect.

Simultaneously, conventional art generally adopts the analogies of experience principle for the design of planisher roller footpath parameter, just according to mathematical statistics method, the planisher roller footpath parameter that has existed is carried out statistical study, drawing regression formula, serves as according to the planisher roller footpath parameter of determining required design with this formula then.Because high-strength steel belongs to steel grade newly developed in recent years, the smooth unit of professional production high-strength steel does not almost have before this, and the roller footpath parameter that therefore adopts traditional heuristic methods to design high-strength steel planishing mill also is impracticable.

Summary of the invention

The objective of the invention is to set up working roll and the backing roll roller footpath designing technique that a cover is fit to high-strength steel planishing mill, require designed working roll that goes out and backing roll roller footpath can guarantee the strip shape quality of smooth product, can reduce the roller consumption of working roll and backing roll in the high-strength steel formation process again, can also satisfy being flattened the requirement of high-strength steel mechanical performance of products.

To achieve these goals, the present invention has adopted following technical scheme, and the step of being carried out by computer system is:

(a) collect roller to be designed high-strength steel planishing mill product thickness scope (H directly _Min～H _Max), width range (B _Min～B _Max), extensibility scope (ε _Min～ε _Max) and the intensity σ of plow-steel _S0

(b) relevant feature parameters of the high-strength steel planishing mill in collection roller to be designed footpath comprises that the maximum draught pressure that long L, the planisher of the body of roll of working roll and backing roll allowed is P _Max

(c) according to product mix, according to certain rule with all product groupings;

(d) optimizing of single formation process working roll and backing roll roller footpath parameter;

(e) Synthetical Optimization of high-strength steel planishing mill working roll and backing roll roller footpath parameter.

Product grouping described in the said method is meant thickness is divided into m by a fixed step size ₁Individual typical value { H ₁, H ₂..., H _M1, width is divided into m by certain step-length ₂Individual typical value { B ₁, B ₂..., B _M2, extensibility is divided into m by a fixed step size ₃Individual typical value { ε ₁, ε ₂..., ε _M3.Like this, in the condition of production of all specification products of high-strength steel planishing mill under different extensibility in fact just will designing all is encompassed in, come to m ₁M ₂M ₃The situation of kind, and available following formula is represented:

C _n＝{H _i，B _j，ε _k i＝1，2，…，m ₁；j＝1，2，…，m ₂；k＝1，2，…，m ₃}

n＝1，2，…，m ₁·m ₂·m ₃

Described in the said method in the single formation process optimizing of working roll and backing roll roller footpath parameter comprise the following step of carrying out by computer system:

1) given working roll and backing roll roller footpath initial value X ₀

2) make working roll and backing roll roller footpath X=X ₀

3) calculate the cross direction profiles value σ of this formation process forward pull _1i, roll gap pressure distribution value q _i

4) calculate the objective function F (X) that single formation process roller directly designs;

5) judge whether the Powell condition is set up,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 2), 3), 4), set up until the Powell condition, finish to calculate, the working roll that draws single formation process and backing roll roller be parameter directly.

Working roll described in the said method and backing roll roller footpath initial value X ₀Can be given according to following rule:

D _b0＝(0.6～0.8)L

D _w0＝(0.286～0.4)D _b0

In the formula: D _W0, D _B0The initial diameter of-working roll and backing roll

The cross direction profiles value σ of forward pull described in the said method _1mi, roll gap pressure distribution value q _MiDuring calculating, relevant pacing items is as follows: the total tension force T in front and back ₁=T ₂=0.2 σ _S0Friction factor is got μ=0.2; The strength of materials is got σ _s=1.1 σ _S0The convexity Δ H of band supplied materials _iDistribution approximate press the quafric curve processing; The size of ratio convexity can value be 0.01 rule of thumb; The plate shape of supplied materials is thought good, promptly gets L _i=0; Working roll and backing roll are pressed plain-barreled roll and are handled, and promptly get Δ D _Wi=0, Δ D _Bi=0; Bending roller force is then got the ground state bending roller force, even S=0.

The objective function F (X) that single formation process roller directly designs described in the said method can be represented with following formula:

$\left\{\begin{array}{c}F\left(X\right)=\mathrm{\α}\·g_1(X,C_n)+(1-\mathrm{\α})\·g_2(X,C_n)\\ P_n({\mathrm{\ϵ}}_{\min },D_w+D_w\·5\%)\≤P_{\max }\end{array}\right.$

In the formula:

X＝{D _w，D _b}

g ₁(X，C _n)＝(max(σ _1in)-min(σ _1in))/T ₁

g ₂(X，C _n)＝(max(q _in)-min(q _in))/ q

The average roll gap pressure of q-;

α-weighting coefficient generally gets 0.35

G in objective function F (X) ₁(X) represent plate shape index, and g ₂(X) then represent the cross direction profiles uniformity coefficient index of roll gap pressure.In constraint condition, why get D _w=D _w+ D _w5%, be the loaded vehicle rate of considering working roll.

The Synthetical Optimization of working roll of high-strength steel planishing mill described in the said method and backing roll roller footpath parameter comprises the following step of being carried out by computer system:

1) given working roll and backing roll roller footpath initial value X ₀

2) make working roll and backing roll roller footpath X=X ₀

3) calculate the cross direction profiles value σ of forward pull in each single formation process _1mi, roll gap pressure distribution value q _Mi

4) calculate the objective function F that each single formation process central roll directly designs _m(X);

5) calculate complex optimum objective function G (X);

6) judge whether the Powell condition is set up,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 2), 3), 4) and step 5), set up until the Powell condition, finish to calculate the directly Synthetical Optimization of parameter of roller and backing roll roller of finishing the work.

The objective function of complex optimum described in said method G (X) can represent with following formula:

$\left\{\begin{array}{c}G\left(X\right)=A_0\·\frac{1}{m}\·\underset{n=1}{\overset{m}{\mathrm{\Σ}}}\sqrt{{(F_n\left(X\right)-\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right))}^2}+(1-A_0)\·\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right)\\ P_n\left({\mathrm{\ϵ}}_{\min }\right)\≤P_{\max },n=\mathrm{1,2},\·\·\·,m\end{array}\right.$

In the formula: m=m ₁M ₂M ₃

A ₀-weighting coefficient generally gets 0.35

Should be noted that single formation process C _nThe optimization result, the planisher roller of reality is directly designed without any guiding value, because in actual production process, can not all design a cover roll for each operation of rolling.Therefore, the roller footpath optimizing design scheme that really is of practical significance, be by a given proper operation roller and backing roll roller footpath, make that (in actual production, the general product of frequent m specification of producing of selecting is optimized roll, and should be weighted according to its probability of occurrence at the product of rolling all specifications, the frequent product of producing, weighting coefficient is obtained big more) time, plate shape is all fine, and roll gap pressure is all very even, mechanical property also can meet the demands.

Description of drawings

By below in conjunction with the description of accompanying drawing, can further understand purpose of the present invention, feature and advantage to the embodiment of the invention.

Fig. 1 is the roller footpath parameter designing calculation flow chart of four roller high-strength steel planishing mills;

Fig. 2 is the working roll and the backing roll roller footpath parametric solution calculation flow chart of the specific formation process high-strength steel planishing mill of the embodiment of the invention 1;

Fig. 3 is according to the working roll of the high-strength steel planishing mill of the embodiment of the invention 2 and backing roll comprehensive Design calculation flow chart.

Embodiment

Embodiment 1

Can know that according to rolling therory total draught pressure of high-strength steel planishing mill can be represented with the function shown in the following formula:

P＝f(D _w，B，H，ε，σ _s，T ₁，T ₀，μ)

In the formula: the total draught pressure of P-;

D _w-work roll diameter;

The B-strip width;

The supplied materials thickness of H-band;

ε-smooth extensibility;

σ _s-the strength of materials;

T ₁, T ₀-front and back tension force;

μ-friction factor.

In the design process of roller footpath, can make tension force T ₁=T ₂=0.2 σ _S0According to the characteristics of planisher, friction factor is got μ=0.2 simultaneously.At last according to the production outline, and consider the fluctuation of material property, the intensity of drawing materials σ _s=1.1 σ _S0Like this, following formula just can be expressed as:

P＝f(D _w，B，H，ε)

Can know the forward pull σ of band in the operation of rolling according to pertinent literature _1i, roll gap pressure q _iThe available following formula function representation of difference:

σ _1i＝f ₁(H，ΔH _i，P，L _i，B，T ₀，T ₁，S，D _w，ΔD _wi，D _b，ΔD _bi)

q _i＝f ₂(H，ΔH _i，P，L _i，B，T ₀，T ₁，S，D _w，ΔD _wi，D _b，ΔD _bi)

In the formula:

Δ H _iThe convexity degree cross direction profiles value of-band supplied materials;

L _i-expression comes the length cross direction profiles value of flitch shape;

D _b-backing roll diameter;

The S-bending roller force;

Δ D _Wi-working roller distributes;

Δ D _Bi-backing roll roll shape distributes.

In the design process of roller footpath, for the convexity Δ H of band supplied materials _iDistribution can be similar to by quafric curve and handle, the size of ratio convexity can value be 0.01 rule of thumb; The plate shape of supplied materials is thought good, promptly gets L _i=0; Simultaneously, press the plain-barreled roll processing, promptly get Δ D for working roll and backing roll _Wi=0, Δ D _Bi=0; Bending roller force is then got the ground state bending roller force, even S=0.Like this, correlation formula just can be expressed as:

σ _1i＝f ₁(H，P，B，D _w，D _b)

q _i＝f ₂(H，P，B，D _w，D _b)

The draught pressure formula is updated to following formula to be got:

σ _1i＝f ₃(H，ε，B，D _w，D _b)

q _i＝f ₄(H，ε，B，D _w，D _b)

Roller directly designs for convenience, according to product mix, thickness can be divided into m by certain rule ₁Individual typical value { H ₁, H ₂..., H _M1, width is divided into m by certain rule ₂Individual typical value { B ₁, B ₂..., B _M2, extensibility is divided into m by certain rule ₃Individual typical value { ε ₁, ε ₂..., ε _M3.Like this, all the specification products of high-strength steel planishing mill in fact just will designing under different extensibility the condition of production all be encompassed in, come to m ₁M ₂M ₃The situation of kind, available following formula is represented:

C _n＝{H _i，B _j，ε _k i＝1，2，…，m ₁；j＝1，2，…，m ₂；k＝1，2，…，m ₃}

n＝1，2，…，m ₁·m ₂·m ₃

Obviously, for any one specific skin pass rolling situation C _n, can know through simple analysis, when other parameters are set by the rule of introducing above, its forward pull σ _1i, roll gap pressure q _iThe diameter D that just is decided by working roll _wDiameter D with backing roll _b, and can further represent with following formula:

σ _1in＝f ₃(D _w，D _b，C _n)

q _in＝f ₄(D _w，D _b，C _n)

Like this, for single specification, carry out smoothly in order to make formation process, take into account plate shape under the prerequisite that product satisfies mechanical property constraint and consume problem with roller satisfying, the objective function that roller directly can be designed can simply be defined as:

$\left\{\begin{array}{c}F\left(X\right)=\mathrm{\α}\·g_1(X,C_n)+(1-\mathrm{\α})\·g_2(X,C_n)\\ P_n({\mathrm{\ϵ}}_{\min },D_w+D_w\·5\%)\≤P_{\max }\end{array}\right.$

X={D in the formula _w, D _b}

g ₁(X，C _n)＝(max(σ _1in)-min(σ _1in))/T ₁

g ₂(X，C _n)＝(max(q _in)-min(q _in))/ q

The average roll gap pressure of q-;

α-weighting coefficient

G in the formula objective function ₁(X) represent plate shape index, and g ₂(X) then represent the cross direction profiles uniformity coefficient index of roll gap pressure.In constraint condition, why get D _w=D _w+ D _w5%, be the loaded vehicle rate of considering working roll.

Fig. 2 is according to the working roll of the specific formation process high-strength steel planishing mill of the embodiment of the invention 1 and backing roll roller footpath parameter designing calculation flow chart.This embodiment is used to the optimizing of single smooth formation process working roll and backing roll roller footpath parameter.Below provided and adopted working roll and backing roll roller footpath parameter designing process and the result of calculation of the inventive method a certain high-strength steel planishing mill:

At first in step 21, at first according to product mix (seeing Table 1), according to certain rule with all product groupings:

Table 1 high-strength steel planishing mill product mix

Parameter name	Numerical range
		The long L/mm strip width of body of roll scope B/mm thickness of strip scope H/mm extensibility scope ε/% product strength σ s/ Mpa mill speed v/mmin -1	1580 500-1450 1.0-6.0 0.5-1.5 800 500-600

Wherein, thickness grouping situation be 1.0,1.2,1.4 ..., 5.8,6.0}, i.e. m ₁=25

Width grouping situation be 500,550,600 ..., 1400,1450}, i.e. m ₂=20

Extensibility grouping situation be 0.5,0.6,0.7 ..., 1.4,1.5}, i.e. m ₃=11

Subsequently, in step 22, the total tension force in given front and back, friction factor, supplied materials convexity, come initial set value such as flitch shape, bending roller force roll shape, its cardinal rule is the total tension force T in front and back ₁=T ₂=0.2 σ _S0Friction factor is got μ=0.2; The strength of materials is got σ _s=1.1 σ _S0The convexity Δ H of band supplied materials _iDistribution approximate press the quafric curve processing; The size of ratio convexity can value be 0.01 rule of thumb; The plate shape of supplied materials is thought good, promptly gets L _i=0; Working roll and backing roll are pressed plain-barreled roll and are handled, and promptly get Δ D _Wi=0, Δ D _Bi=0; Bending roller force is then got the ground state bending roller force, even S=0.

Subsequently, in step 23, provide the initial value X of work roll diameter and backing roll diameter ₀={ D _W0, D _B0, and with X ₀Given according to following rule:

D _b0＝(0.6～0.8)L

D _w0＝(0.286～0.4)D _b0

Subsequently, in step 24, make working roll and backing roll roller footpath parameter X=X ₀, i.e. X={1106,331}

Subsequently, in step 25, calculate specific skin pass rolling situation C _nThe cross direction profiles value σ of the forward pull of following correspondence _1i, roll gap pressure distribution value q _i, suppose C _n=1.0,500,0.5}

Subsequently, in step 26, calculate the used objective function F (X) of roller footpath optimal design.

In step 27, judge whether the Powell condition is set up subsequently,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 24), 25), 26), set up until the Powell condition, finish to calculate, the optimum working roll that draws single formation process and backing roll roller be parameter directly.

Subsequently, in step 28, export the optimum working roll and the backing roll roller footpath parameter of single formation process, X={1200,400}.

Embodiment 2

Obviously, can know single formation process C by analysis _nThe optimization result, the planisher roller of reality is directly designed without any guiding value, because in actual production process, can not all design a cover roll for each operation of rolling.Therefore, the roller footpath optimizing design scheme that really is of practical significance, be by a given optimal working roller and backing roll roller footpath, make that (in actual production, the general product of frequent m specification of producing of selecting is optimized roll at the product of rolling all specifications, and should be weighted according to its probability of occurrence, the frequent product of producing, weighting coefficient is obtained big more) time, plate shape is all fine, and roll gap pressure is all very even, and mechanical property meets the demands simultaneously.At this moment, the objective function of optimization design function should be represented with following formula:

$\left\{\begin{array}{c}G\left(X\right)=A_0\·\frac{1}{m}\·\underset{n=1}{\overset{m}{\mathrm{\Σ}}}\sqrt{{(F_n\left(X\right)-\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right))}^2}+(1-A_0)\·\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right)\\ P_n\left({\mathrm{\ϵ}}_{\min }\right)\≤P_{\max },n=\mathrm{1,2},\·\·\·,m\end{array}\right.$

In the formula: A ₀-weighting coefficient generally gets 0.35

Fig. 3 be according to the embodiment of the invention 2 the working roll and the backing roll comprehensive Design calculation flow chart of high-strength steel planishing mill.This embodiment is used to the comprehensive Design in high-strength steel planishing mill working roll and backing roll roller footpath and calculates.Below provided and adopted working roll and backing roll roller footpath parameter designing process and the result of calculation of the inventive method a certain high-strength steel planishing mill:

In step 31, at first, thickness is divided into m by a fixed step size according to product mix (seeing Table 2) ₁Individual typical value { H ₁, H ₂..., H _M1, width is divided into m by certain step-length ₂Individual typical value { B ₁, B ₂..., B _M2, extensibility is divided into m by a fixed step size ₃Individual typical value { ε ₁, ε ₂..., ε _M3.Like this, all the specification products of high-strength steel planishing mill in fact just will designing under different extensibility the condition of production all be encompassed in, come to m ₁M ₂M ₃The situation of kind, and available following formula is represented:

C _n＝{H _i，B _j，ε _k i＝1，2，…，m ₁；j＝1，2，…，m ₂；k＝1，2，…，m ₃}

n＝1，2，…，m ₁·m ₂·m ₃

Table 2 high-strength steel planishing mill product mix

Parameter name	Numerical range
		The long L/mm strip width of body of roll scope B/mm thickness of strip scope H/mm extensibility scope ε/% product strength σ s/ Mpa mill speed v/mmin -1	1580 500-1450 1.0-6.0 0.5-1.5 800 500-600

Wherein, thickness grouping situation be 1.0,1.2,1.4 ..., 5.8,6.0}, i.e. m ₁=25

Width grouping situation be 500,550,600 ..., 1400,1450}, i.e. m ₂=20

Extensibility grouping situation be 0.5,0.6,0.7 ..., 1.4,1.5}, i.e. m ₃=11

Subsequently, in step 32, the total tension force in given front and back, friction factor, supplied materials convexity, come initial set value such as flitch shape, bending roller force roll shape, its cardinal rule is the total tension force T in front and back ₁=T ₂=0.2 σ _S0Friction factor is got μ=0.2; The strength of materials is got σ _s=1.1 σ _S0The convexity Δ H of band supplied materials _iDistribution approximate press the quafric curve processing; The size of ratio convexity can value be 0.01 rule of thumb; The plate shape of supplied materials is thought good, promptly gets L _i=0; Working roll and backing roll are pressed plain-barreled roll and are handled, and promptly get Δ D _Wi=0, Δ D _Bi=0; Bending roller force is then got the ground state bending roller force, even S=0.

Subsequently, in step 33, provide the initial value X of work roll diameter and backing roll diameter ₀={ D _W0, D _B0, and with X ₀Given according to following rule:

D _b0＝(0.6～0.8)L

D _w0＝(0.286～0.4)D _b0

Subsequently, in step 34, make working roll and backing roll roller footpath parameter X=X ₀,, i.e. X={1106,331}

Subsequently, in step 35, calculate specific skin pass rolling situation C _nThe cross direction profiles value σ of forward pull in each single formation process of following correspondence _1ni, roll gap pressure distribution value q _Ni, its calculation expression is:

σ _1in＝f ₃(D _w，D _b，C _n)

q _in＝f ₄(D _w，D _b，C _n)

Subsequently, in step 36, calculate the used objective function F of single formation process roller footpath optimal design _n(X), as shown in the formula shown in (27):

$\left\{\begin{array}{c}F\left(X\right)=\mathrm{\α}\·g_1(X,C_n)+(1-\mathrm{\α})\·g_2(X,C_n)\\ P_n({\mathrm{\ϵ}}_{\min },D_w+D_w\·5\%)\≤P_{\max }\end{array}\right.$

In the formula: X={D _w, D _b}

g ₁(X，C _n)＝(max(σ _1in)-min(σ _1in))/T ₁

g ₂(X，C _n)＝(max(q _in)-min(q _in))/ q

The average roll gap pressure of q-;

α-weighting coefficient

Subsequently, in step 37, calculate comprehensive high-strength steel planishing mill roller footpath complex optimum objective function G (X).

In step 38, judge whether the Powell condition is set up subsequently,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 34), 35), 36), 37), set up until the Powell condition, finish to calculate, the optimum working roll that draws and backing roll roller be parameter directly.

Subsequently, in step 39, the working roll of output behind the complex optimum and backing roll roller footpath parameter, X={1250,430}, the best roller that Here it is is fit to this high-strength steel planishing mill is parameter directly.

Claims (6)

1, a kind of method for designing of roller diameter of four-roller high-strength steel planishing mill is characterized in that: comprise the following step of being carried out by computer system:

(a) the production outline of the high-strength steel planishing mill in collection roller to be designed footpath comprises smooth product thickness scope (H _Min～H _Max), width range is (B _Min～B _Max), extensibility scope (ε _Min～ε _Max) and the intensity σ of plow-steel _S0

(b) relevant feature parameters of the high-strength steel planishing mill in collection roller to be designed footpath comprises that the maximum draught pressure that long L, the planisher of the body of roll of working roll and backing roll allowed is P _Max

(c) according to product mix, according to certain rule with all product groupings;

(d) optimizing of single formation process working roll and backing roll roller footpath parameter, finish the optimizing of single formation process working roll and backing roll roller footpath parameter according to the following steps:

1) given working roll and backing roll roller footpath initial value X ₀

2) make working roll and backing roll roller footpath X=X ₀

3) calculate the cross direction profiles value σ of this formation process forward pull _1i, roll gap pressure distribution value q _i

4) calculate the objective function F (X) that single formation process roller directly designs;

5) judge whether the Powell condition is set up,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 2), 3), 4), set up until the Powell condition, finish to calculate, the working roll that draws single formation process and backing roll roller be parameter directly;

(e) Synthetical Optimization of high-strength steel planishing mill working roll and backing roll roller footpath parameter, finish the directly Synthetical Optimization of parameter of high-strength steel planishing mill working roll and backing roll roller according to the following steps:

1) given working roll and backing roll roller footpath initial value X ₀

2) make working roll and backing roll roller footpath X=X ₀

3) calculate the cross direction profiles value σ of forward pull in each single formation process _1ni, roll gap pressure distribution value q _Ni

4) calculate the objective function F that each single formation process central roll directly designs _n(X);

5) calculate complex optimum objective function G (X);

6) judge whether the Powell condition is set up,, adjust working roll and backing roll roller footpath initial value X if be false ₀, repeat above-mentioned steps 2), 3), 4) and step 5), set up until the Powell condition, finish to calculate the directly Synthetical Optimization of parameter of roller and backing roll roller of finishing the work.

2, the method for designing of roller diameter of four-roller high-strength steel planishing mill according to claim 1 is characterized in that, the product grouping in the described step (c) is meant thickness is divided into m by a fixed step size ₁Individual typical value { H ₁, H ₂..., H _M1, width is divided into m by certain step-length ₂Individual typical value { B ₁, B ₂..., B _M2, extensibility is divided into m by a fixed step size ₃Individual typical value { ε ₁, ε ₂..., ε _M3; Like this, all the specification products of high-strength steel planishing mill in fact just will designing under different extensibility the condition of production all be encompassed in, come to m ₁M ₂M ₃The situation of kind, and can simply represent with following formula:

C _n＝{H _i，B _j，ε _k i＝1，2，…，m ₁；j＝1，2，…，m ₂；k＝1，2，…，m ₃}

n＝1，2，…，m ₁·m ₂·m ₃

3, the method for designing of roller diameter of four-roller high-strength steel planishing mill according to claim 1 is characterized in that, working roll in the described step (d) and backing roll roller footpath initial value X ₀Can be given according to following rule:

D _b0＝(0.6～0.8)L

D _w0＝(0.286～0.4)D _b0

In the formula: D _W0, D _B0The initial diameter of-working roll and backing roll

4, the method for designing of roller diameter of four-roller high-strength steel planishing mill according to claim 1 is characterized in that, the cross direction profiles value σ of forward pull in the described step (d) _1mi, roll gap pressure distribution value q _MiDuring calculating, relevant pacing items is as follows: the total tension force T in front and back ₁=T ₂=0.2 σ _S0Friction factor is got μ=0.2; The strength of materials is got σ _s=1.1 σ _S0The convexity Δ H of band supplied materials _iDistribution approximate press the quafric curve processing; The size of ratio convexity can value be 0.01 rule of thumb; The plate shape of supplied materials is thought good, promptly gets L _i=0; Working roll and backing roll are pressed plain-barreled roll and are handled, and promptly get Δ D _Wi=0, Δ D _Bi=0; Bending roller force is then got the ground state bending roller force, even S=0.

5, the method for designing of roller diameter of four-roller high-strength steel planishing mill according to claim 1,, it is characterized in that the objective function F (X) that list-formation process roller directly designs in the described step (d) can be represented with following formula:

$\left\{\begin{array}{c}F\left(X\right)=\mathrm{\α}\·g_1(X,C_n)+(1-\mathrm{\α})\·g_2(X,C_n)\\ P_n({\mathrm{\ϵ}}_{\min },D_w+D_w\·5\%)\≤P_{\max }\end{array}\right.$

In the formula: X={D _w, D _b}

g ₁(X，C _n)＝(max(σ _1in)-min(σ _1in))/T ₁

g ₂(X，C _n)＝(max(q _in)-min(q _in))/ q

The average roll gap pressure of q-;

α-weighting coefficient generally gets 0.35

6, the method for designing of roller diameter of four-roller high-strength steel planishing mill according to claim 1 is characterized in that, complex optimum objective function G (X) can represent with following formula in the described step (e):

$\left\{\begin{array}{c}G\left(X\right)=A_0\·\frac{1}{m}\·\underset{n=1}{\overset{m}{\mathrm{\Σ}}}\sqrt{{(F_n\left(X\right)-\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right))}^2}+(1-A_0)\·\frac{1}{m}\underset{n=1}{\overset{m}{\mathrm{\Σ}}}{F}_n\left(X\right)\\ P_n\left({\mathrm{\ϵ}}_{\min }\right)\≤P_{\max },n=\mathrm{1,2},\·\·\·,m\end{array}\right.$

In the formula: m=m ₁M ₂M ₃A ₀-weighting coefficient generally gets 0.35

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